The findings may not apply to people with advanced Parkinson's disease.
He turned 90 in August and is suffering from advanced Parkinson's disease.
His family said his death was caused by complications of advanced Parkinson's disease.
This technique is the preferred surgical method of treating most cases of advanced Parkinson's disease.
Now, with advanced Parkinson's and glaucoma, he is working on three books.
Early studies have also examined ondansetron as a possible treatment for psychosis resulting from advanced Parkinson's disease.
"They had all the features of advanced Parkinson's," he added.
Despite advanced Parkinson's disease, Flores is still an active artist.
Pallidotomy may be considered when a person with advanced Parkinson's disease has:
Cleveland died at the age of eighty-six of advanced Parkinson's disease.